Wii U - I don't know if the Pokémon Mystery dungeon series is classified as a dormant exclusive, but It has not seen a all new good installment for quite awhile (I'm talking about the Wii games). I would also want a new 3D plattformer from Nintendo that uses some gameplay mechanics that Sunshine had, heck even a sequel would be good enough. Can't forget a new 3D Donkey Kong game, in a similar style as DK64, but with less characters and shitty minigames like gnawty hunter or whatever It's called. Either way, I will buy the system at launch.
PS4 - A new Jak & Daxter game, only played 2 & 3 but they were amazing in my opinion, I could also settle with another Persona game (been playing through P3-FES, lately).
720 - I would like a new Banjo and Conker, but they are not enough for me to buy that system.
Check out my Upcoming Wii U Games 2014 Thread
3DS Friend Code: 4553 - 9954 - 4854. Name - David